To measure an event and count each user only once per day (i.e., each user is counted a single time per day, regardless of how many times they performed the event that day), you should use the "Unique Users" measurement with a daily interval in Mixpanel.
Here's how you can do this in Mixpanel Insights:
1. Create an Insights report.
2. Select the event you want to measure.
3. Set the time interval to "Day".
4. Change the measurement to "Unique Users".
This setup will count each user only once per day, even if they perform the event multiple times on that day. For example, if a user performs the event three times on the same day, they will still only be counted once for that day.
This approach is described in the documentation:
"Unique Users: The number of users who performed [event] or are a part of the cohort. Example: What’s the count of users who watched a video?"
"Daily Active Users (DAU): The number of users who performed [event] within the last 24 hours. Example: What’s the count of users who watched a video on the last day?"
Insights: Users
By using the "Unique Users" measurement with a daily interval, you achieve exactly the behavior you described.
